PDCD1 and esophageal squamous cell carcinoma: According to the median value of PD1 density in macrophages, ESCC patients who underwent curative resection with follow-up data were divided into PD1+ TAM high group (n = 26, Table 1) and PD1 + TAM low group (n = 31, Table 1), and the readouts observed negative association between the frequency of PD1+ TAMs and the survival of patients with ESCC (Fig. 1e).